MythOnMacOSX
“This guide is meant for those who would like to try out the latest MythTV code on Mac OS X, but are having trouble setting up the development environment. Many folks have had trouble figuring out which dependencies and versions are necessary, so this will help you get to a known working configuration. If you like to copy-and-paste commands, you’ll love this guide.”

I do not know whether this is just a frontend or not, but from first glance, it appears so.
Maybe this is what the Mac users have been waiting for.